Suction fuel feeding apparatus for internal combustion engines



Sept. 20, 1932. Q s, BURTQN 1,877,806

SUCTION FUEL FEEDING APPARATUS FOR INTERNAL COMBUSTION ENGINES Filed Sepi. l5, 1950 5 Sheets-Shed l 48 4766 j? 46 o7 59" Q O i l A I den ZO 44 l/7 /f/es QIZZZ Sept; 20, 1932. Q SBURTON 1,877,806

SUCTION FUEL FEEDING APPARATUS FOR INTERNAL COMBUSTION ENGINES Filed Sept. 15, 1950 3 Sheets-Sheet 2 Sept. 20, 1932. Q ,s BURTON 1,877,806

SUSTfIO'N FUEL FEEDING APPARATUS FOR INTERNAL COMBUSTION ENGINES Filed sept. 15. 195o s sheets-sheet 5 @51g L 0222?? Q15 Patented Sept. 20, 1932 GFFICE CHARLES S. BURTON, OF OAK PARK, ILLINOIS sUcTIoN nenn rnnnrne errer-,Artis Application led September The purpose of this invention is to provide an improved means for moving liquid from a low level source to a place of use adapted particularly for supplying liquid '5l fuel to an internal combustion engine on a motor vehicle having a main fuel supply tank at the rear of the vehicle, creating necessity for lifting the fuel more or less A according to the grade of the roadway on which the vehicle may be travelling. It consists in the elements and features of construe tion and method of operation shown and de scribed as indicated in the claims.

. According to the principle of this invention the fuel is to be lifted by suction, derived in some manner from the ruiming of the engine, to a receptacle from which it is to be delivered from the engine carbureter,

, according to engine requirement; and for such delivery it must be released from. the suction by which it has been lifted in order that it may flow by gravity under atmospheric pressure toward the carbureter.

The invention is concerned with the method and means according to and by which the alteration between suction and :atmospheric pressure is effected. rlhis method consists in utilizing the weight of the liquid lifted and delivered at each alternation as the motive force for actuating the parts by whose movement the access of atmospheric pressure is eiiected and interrupted, avoiding the necessity for float or like means commonly emi. ployed .in vacuum fuel feeding devices for alternating the dominance of suction and atmospheric pressure for the like purpose.

Referring to the drawings:

Figure l -s a vertical section of an appara- 1 tus embodying the invention in one of its 40 forms showing the parts in the position occupied normally when the apparatus is empty of liquid, and the engine is not running.

Figure 2 is a top plan. view of the same.

Figure 3 is a section at the line 3-3 on igure 1.

Figure 4: is a view similar to Figure 1 showing the movable parts at the position occupied when the vacuum chamber is filling due to suction operating therein, and just FOR NTEBNAL COMBUSTION ENG-INES 15, 1930. Serial No. 482,146.

before the suction phase is terminated by opening of the atmosphere valve.

Figure 5 is a section at the line 5--5 on Figure 3.

Figure 6 is a detail view like Figures 1 and l showing the parts at the position occupied just after the atmosphere valve is opened, and while the liquid is being discharged from the vacuum chamber.

Figure 7 is a view similar to Figure 1 showing a modiication.

Figure 8 is a top plan View of the form shown in Figure 7.

Figure 9 isa section at the Figure 7.

Figure 10 is Figure 8.

Figure 11 is a view of the form shown in Figure 7 showing the parts at the position corresponding to that shown in Figure 6 of the first form.

Referring to the form shown in Figures 1 to 6 The apparatus comprises a casing, 10, which is designed to be mounted in fixed position, as indicated in Figure 1, which shows it mounted at the vehicle dash, S. This casing, 10, is shown coinprisinga cylindrical shell of sheet metal indicated by the numeral, 11, a top plate member, 12, hereinafter referred to as the cover, and a bottom plate 13, said three parts being united by securing the cover and bottom plate, respectively, to top and bottom flanges, 16 and 17, of the cylindrical member, 1-1, by screws indicated at 18. a gasket, 19, being interposed to make the bottom joint lealless, this precaution being' unnecessary at the top.

The cover, 12, is provided with elbow nipples, 20 and 21, for connecting respectively the fuel supply pipe, 22, and the suction pipe, 23, the former leading from the low level fuel source (not shown) and the latter leading to any source of adequate suction (not shown) and the cover is apertured as seen at 12X, 12X, for free atmosphere access.

Both the nipples, 20 and 21, protrude from the under side of the cover, 12, for convenience of connecting to them respectively, flexible tubes, 24 and 25, to be connected at their line 9 9 on a section at the line 10-1 0n sheet metal stainpinghaving its upper margin flanged, as seen at 41a, for convenience of clamping to it the top plate, 42, by screws, 'as

seen at 42a, with a gasket, 43, interposed for sealing the joint.

At the bottom of the cup member, 40, it is provided with a discharge fitting, 44, furnished with a valve, 45, normally seating by gravity and related to its seat for being held seated by suction and, adapted to be opened by discharge flow of the liquid upon relief of the suction aszhcreinafter described.

The top plate, 42has beside the nipples 20a and 2la for connecting the flexible tubes, 24 and 25, an opening, 47, of which its margin at the upper side of the plate is finished for seating a valve, 48, hereinafter referred to as the atmosphere valve. Said top plate, 42, has a seco-nd opening, 49, at which there is secured, closing said opening, a flexible diaphragm, 50, bound fluid tight at its margin to the margin of the opening,i49, by means of a clamping ring,5l, secured by screws, 51a.

The atmosphere valve, 48, is formed with a short stem, 48a, and the diaphragm, 5.0, is clamped at its central area betweenl discs, 52 and 53, by a threaded stem, 54, with nuts, 54 and 54h, above and below the discs, 52 and 53, respectively, for clamping the discs and securing the stem at the center of thediaphragm. Ata suitable point on the plate, 42, in line with the valve stem and the diaphragm stem, there is positioned a fulcrum post, e6, for a lever, 57, ,which is connected at its opposite ends by suitable pivot pinsto the valve stem and diaphragm stem respectively, said stems being adjusted in the valve and diaphragm respectively to cause the valve to be held 0E its seat by the diaphragm ilexed inwardly with respect to the cavity of the con-V tainer, 40, and to be seated when the diaphragm is substantially flat or flexed outwardly an amount of'whichY it is readily susceptible.

The container, 40, is arranged to be guided in up and down movement of which it is susceptible, and for whichV the length and flexibility of the flexible tubes, 24 and 25, are adaptecL-,by any convenient means as by lugs, 58, 58,58, set into the edge of the top plate, 42, and spanning the annular interval between the periphery of said top plate and the inner walltof the shell ll. Y 1

The upwardly and downwardly movable container, 40, is yieldingly upheld in the fixed casing, 10, by a spring, 59, arranged for reacting in any convenient place and manner between the two parts, upwardly with respect to the container and downwardly with respect to the fixed shell. As shown, this spring is a helically coiled wire with its upper coil of least diameter seating under the flange, 4l, of the cup member, 40, and its bottom coil of greater diameter substantially litting within the shell, l1, at the lower end and seating on the bottom plate, 13. Y

This spring is dimensioned'for being compressed in the assembling of the parts to condition it for resilient reaction to uphold the empty container, 40, to the position shown in Figure l, and to yield under the weight added by the liquid occupying the container to a predetermined depth, to permit the container to descend to the position shown in Figure 5.

Upon considering the construction as thus far described it may be understood that starting with the apparatus empty, the container, 40, will be upheld by the spring, 59, at the position shown in Figure l; and upon the engine starting developing suction operating through the suction line and the flexible tube, 25, producing vacuum in the container, 40, fuel will be lifted through the .supply line, 22, and delivered through the flexible tube, 24, into the container, 40, causing the latter to be depressed by the added weight of the fuel.

rl`he relative diameters ofthe valve, 48, and the diaphragm, 50, are calculated in view of the relative lengths of the two arias of the lever, 57,whieh connects the valve and diaphragm, to cause the suction hold on the valve to slightly exceed the opposing pull of the diaphragm due to the saine degree of suction operating on the diaphragm. The valve, 48, is connected by any convenient form of flexible connection, as the light chain, V75, with the cover, l2, of the shell, ll, the connection being preferably made by an interposed resilient part such as the flat spring 56, secured at one end to the cover plato and having the chain attached to its free end. rlhe chain, .75, is of such length that its slack is entirely taken up in the descent of the container as described; and at the limitv of that descent the spring, 76, .will be flexed and caused to exert resilient pull on the chain and thereby on the valve, 43.

Upon considering the operation of the' structure as thus further described, it may be understood that when the container, l1, is depressed, as described, by the additiony to its own weight of the weightof fuel drawn into it, and when that depression has taken up the slack of the chain, 75, the further depression flexing the spring, 76, and bringing its resiliency into operation, when that resilient reaction becomes greater than the suction hold on the valve, 48, due to the slight excess mentioned of the area of the valve yeli'ectively exposed to the suction, over the area of the diaphragm effectively exposed to the same suction, the reaction of the spring will snap the valve open.

When this happens,l-requiring a movement of the valve only a distance equal to one-fourth the diameter of the atmosphere port, which, in the construction shown, may be understood to be about of an inch, mal;- ing the movement for complete opening only g-- of an inch,-the free admission of atmospheric pressure to the cavity ofthe container, in view of the relative areas of at the atmospheric port and suction porn-@Tja of an inch being ample for the latten-causes the vacuum remaining in the cavity of the container to be negligible for upholding the liquid content under condition of maximum suction necessary for the maximum fuel lift required in the case of a. motor vehicle engine having the fuel supply at the rear end; and accordingly; when the atmosphere valve is opened as described, the fuel immediately begins to discharge through the discharge fitting, 44, past the valve, 45, into the casing, 10, and thence by the discharge fitting, 31, and pipe, 32 tothe carbureter or other place of use.

, It may be noted that the retraction of the valve from its seat to the distance for eifecting complete opening,*3g of an inch when the atmosphere port is 1% of an inch in diameter,-will be certain to take place, since as soon as the valve leaves its seat even for a fraction of tliefull opening movement, the suction hold on the 'valve `will be almost en tirely defeated while the suction pull on the diaphragm will be diminished gradually, and will not at any time be entirely lost, and a residual vacuum always remains in the cavity of the container, because th-D suctionport is never closed.

It may be readily calculated that with the relative diameters of the atmosphere port and suction port, atmosphere port 1/2 inch in E diameter, and suction port l-( inch in diameter,-the residual vacuum in the vacuum chamber when the atmosphere valve is fully open, will be only sufficient to sustain about an inch and a. half column of gasoline when the vacuumdue to engine suction with the atmosphere valve closed is that measured by 6 hg; and the device will be fully operative for maximum fuel lift required in supplying an engine on a motor vehicle from a rear tank `for which vacuum of 3 hg. is sufficient,

with an atmosphere port 1/2 inch diameter if the depth of the chamber in which the liquid is accumulated, from a level at which i the fuel load is adequate te evercome the resiliency of the supporting' spring, down to the level of dischargepast the valve, A15, exceeds one inch. That is to say, under these circumstances, the liquid will be dischargedfrom the vacuum chamber to within about an inch of the level at which the discharge occurs past the valve, 45. y

By making the atmosphere port 3/4 of an inch as shown in the drawings, and correspondingly enlarging the diaphragm, 50, the margin of residual vacuum will be reduced and the depth which will not be discharged will be correspondingly reduced so as to be negligible. And it is considered entirely practicable to make the atmosphere port one inch in diameter, since the diaphragm may be correspondingly enlarged so as to counterf balance the suction hold to the narrow margin desirable for ready opening of the valve, particularly because, the larger the diaphragm the less the flexure necessary for re` acting on the valve, and the less the liability of deterioration of the diaphragm.

Under conditions of engine operation malting the vacuum due to engine suction when the atmosphere valve is closed that measured by 6 hg, it may be readily calculated that with the atmosphere port enlarged to one inch diameter and the suction port retained at lgf of an inch, which is ample, the height of gasoline column which will be upheld by the residual vacuum when the atmosphere valve is open, is reduced to about l/QOO of an inch, practically zero.

Upon considering the operation of this apparatus when it is connected for supplying an engine'carbureter, it will be understood that whenever the fuel supply exceeds the engine requirement, the fuel will accumulate first in the pipe, 32, filling it up to the connection with the container, l0, and then if the supply continues to exceed the engine consumption, the fuel will accumlate in the cavity-of the container, 10, up to the discharge valve, 45, and then still upward around the inner movable container, 40. And when this condition arises and continues, it will come to pass that in some instances of emptying of the container, 40, the outflow from that chamber will raise the level of liquid in the casing chamber to the lowered level of the inner container; and thereupon, a balance of static pressure being created, the descent of the container will be halted, with the atmosphere valve open; and no further fuel lifting action will occur until engine consumption` lowering the level of the fuel in the casing chamber, permits the container to descend to the limit of its range of movement and close the atmosphere valve so as to reestablish a condition of suction.

In Figures 6, 7 and 8 there is shown a modiiication of this invention designed for avoiding the use of the flexible tubes for connecting the suction of the fixed outer container with the Inovably mounted yieldingly upheld inner con tainer which constitutes the vacuum chamber and liquid accumulating chamber.

In this modification the fixed outer casing,

pipe and fuel pipe nipplesV A, for enclosing:themaincavity shown as of sheet metal stamping in cup form, hasthe cover plate, A1bound,liuidftight'to the body member',.as indicated" by the gasketa;1,.interi posed betweenthe upper end flange,a, of the cylindrical bodymember, A, and the shoulder of4 the cover plate Vagainst which it is bound by the screws, 001.'

IThe cover platehas a nipple, a5, for'connecting the fuel supply pipe-indicated at A5, and a nipple, a, for connecting the suction pipe indicated at A,Y theplatter having restricted suction port, as seen at a6".

i The cover plate has beside the fuel and suction connections, an atmosphere inlet port, as, marginally finished at the upper side of the cover plate for seating the atmosphere valve, A8, and an aperture, a9, closed by a ieX-ible diaphragm, A9said atmosphere port and valve being dimensioned relatively to the diaphragm-closed aperture and diaphragm, as described with respect tothe like elements and features of the construction shownin the` earlier described. figures. Y The diaphragm, A9, and valve, A8, are connected as in the earlier figures by a lever, A4, fulcrumed on a depending post,A1, and-connected at one end to the stem, w18, of the valve, AS, and the other end to the stem, am, ofthe diaphragm, A9. f

The bottom plate, A2, has ra centrally mounted hollow-stemmed discharge'fitting, A2", furnished with a discharge valve, A21, arranged to be normally seated, and' to be opened by the discharge flow; and attached to the underside ofthe bottom plate, A2, there is secured: by liquid-tight joint, as indicated by the gasket, @21, a'hood, A12, constituting an addition to the casing, A, and whose cavity constitutes a liquid receiver chamber andhas connected toit a fuel delivery` pipe, A13, leading to the engine cara bureter or other place of use.

Vithin the outer casing, A,V there is mounted for limited upv and down movement an upwardly openfuell receiver, B, whose open upper end mouth is overhung by the fuel supply nipple,v a5, so that fuel vdrawn in through the fuel supply pipe by suction is discharged into the fuel receiver,'B. Y

This element, which may also be referredto as the vacuum chamber since its cavity constitutes` the essential part of the chamber in which vacuum is produced for indrawing of the fuel,-is guided in its up and down movement by lugs, b, b, mounted eXteriorly at convenient position, and? by a discharge nip-Y ple, B1, with which the fuel receiveris terminated at the center of its'bottom, and1 which,

is dimensioned for telescoping in the hollow stem, of the discharge fitting, A20.

`The fuel receiving chamber, B, is upheld in thev casing, A, by a spring, D, similar to the spring, 59, of the first described form, said springbeing dimensioned suitably for beingconditioned in assembling the parts so that`I it will uphold the empty fuel receiver, Aand will yield tol allow the same to descend a predetermined;-V distance under the load of liquid accumulated in it to a predeterminedz'depth', and will react'V to restore the receiver, A, to fully elevated position upon discharge of its fuel'load.

In this construction theatmosphere valve, AS, normally seatedi by gravity and-1 the reaction of the diaphragm, A9,. to its normally flat form, is operative for` opening by the descent of the container, B', underv full load of. fuel, by means of a flexible connector, as the chain, B2, which isconnected at one end to the stem of the diaphragm, A9, and at the other end to the free end ofthe flat spring, B3, secured at its other end to the container, B; and theatmospherevalve is closed in the rising movement ofthe container, B, by the encounter of a stud, b4, screwed into a bracket lug, B1, mounted onzthe container for encounter of the end of the lever, A4, to which the diaphragm A, is connected, said stud being adjustable byl screwing up or down to give L the proper action at the proper point in the rising movement of the container, B, as it is relieved of the loadf and conditioned for yielding to the reaction of the spring.

The casing member described as the hood, A12, has connected with it' and constituting a. part of the iixed casing, a standpipe, A15, which eXtendsvupwardly alongside the main casing member, A, and is open to atmosphere at a point above the high liquid level of the container, B,-that is, the highest level to which the container is occupied by liquid when it is thus loadedvto the degree `for over-v coming the resistance of the 'supporting spring, D, and is thereby caused to descend and operate the atmosphere valve for opening to'relieve thevacuum and cause the delivery of the liquid to thefchamber afforded by thehood, A12.

Upon considering these modified features in comparison with the first described form. it may' be recognized that the principle of construction and operation is substantially the Ysame'in both: forms, but thatr in the sec-i ond described form, theV chamber in which the vacuum is produced includes the entire cavity of the outer shell, A,fas well as the cavity'of the upwardly open cupl member, B, therein; and that inthis second form the-liquid cannot at any stage in the proper operatic-n of the structure e-nter the cavity of the casing outside the upwardly open container,y B, unlessleak should. occur at the telescopic. connection of the discharge nipple, B1, with the discharge fitting,v A20; and the liabilityv to such leakage may be rendered negligible by dimensioning the nippleandthe bore of the stem of the discharge fitting foreasy sliding of the nipple in thestem, because by reason of the iiow capacity of the nipple, beingV slightly greater than the flow capacity of the discharge connection of the hood, A12, with the pipe, A3, thereby preventing the liquid flowing out of the hood as fast as it flows in, during the liquid discharge phase of the operation of the apparatus, the hood cavity will be filled with liquid which provides a liquid seal for the telescoping joint sufhcient to prevent any leak duringthe suctionphase; and when the supply of fuel delivered exceeds the engine use, so that there is an accumula tion in the standpipe, no disadvantage will result from any leakage of liquid which might occur through the telescoping joint into the cavity of the casing, A, and on the contrary, there will be lsome advantage resulting from the limited leaking of liquid back into the chamber because it would insure the maintenance of liquid seal preventing the defeat of the vacuum.

But in any event in the construction as illustrated, the discharge Vfitting, A20, with the low passage leading to the valve, A21, is U-shaped, and with the upwardly trending discharge limb, of the U-form extending a substantial distance above the level to which the discharge end of the discharge nipple, B1, of the fuel receiver, B, will 'be withdrawn at the highest position of the part, B, so that the telescoping joint between the nipple and the fitting, A20, will always be liquid sealed after the first emptying operation of the vacuum chamber, the fuel receiver, B.

l claim: 1. A construction formoving liquid from `a source at a lower level to a higher level and delivering it by gravity to a place of use comprising a chambered casing; a liquid container enclosed in a chamber of the casing and movable up and downtherein, and means for yieldingly supporting it at predetermined position therein; means aording and controlling suction connection atmospheric access and liquid inflow to said container, the container being depressed against the resistance of the yielding upholding means by the weight of liquid drawn into the container while the atmosphere access is closed, the casing having a second chamber into which the container discharges; a discharge fitting through which the container dischargesprovided with a valve opening for dischargeand normally closed and adapted to be held closed by suction operating in the container cavity.

2. The construction dehned in claim l, the casing chamber in which the container discharges having'extent in which liquid may rise to a point above the level to which the container is loaded with liquid thereby overcoming the resistance of the yielding upholding means, and having continuously open atmosphere access above that level.

3. A construction for moving liquid to a higher level from a source at a lower level and delivering it by gravity to a place of use or accumulation, comprising a liquid container into which the liquid is drawn from thelower source and in which it is retained against gravity discharge by suction due to vacuum in the cavity of the container, said container having connection constituting access for suction and means for air outlet' to a source of suction, and independent connection for liquid iniiow from the liquid source,'said container being constructed and arranged for discharge of liquid therefrom by gravity upon relief of the suction, and being mounted for -up-and-down movement, and yielding means by which said container is yieldingly upheld at a predetermined position, said container having also access for atmospheric pressure and means for alternating the dominance of suction and atmospheric pressure in the container cavity said means comprising an element arranged for actuation in one direction in the movement of the container due to its weight plus that of the liquid content thereof exceeding the resistance of the yielding upholding means, and in the other direction by the reaction of said means upon the delivery of the liquid from the container relieving it of said plus weight, comprising a casing in iiXed position and encompassing the container and having a chamber into which the container chamber discharges, said casing chamber being open to atmosphere at a point above the level to which liquid occupies the container chamber for overcoming the yielding supporting means, the casing having at' iiXed position connections for attaching a liquid supply conduit anda suction conduit, and flexible duct members within the casing chamber leading' from said fixed connections respectively for connection with the movable container for access thereto of suction and liquid respectively.

4. In a container for moving liquid from a source at' a lower level to a higher level and delivering it by gravity to a place of use comprising a container having a liquid accumulating chamber with liquid inflow connection -with the low level source and liquid outiiow connection with the place of use; a casing having a chamber within which said container is supported, said casing being mounted in iixed position; means by which the container is yieldingly supported by the casing, the container having connection with a source of suction and having an atmosphere l fifi4 Veo means, -the casing having a second-chamber connected `for discharge of 'the' container thereinto with'valve means controlling said discharge and preventing discharge during the suction phase andpreventing reverse flow at all times, vthe casing having a standpipe extending from the last mentioned casing chamberupwardly to a point above'thepredetermined level to which theV container will be illed inl accumulating weight of liquid suiicient for depressing it in opposition to the yielding upholding means; whereby liquid delivered to the secondmentioned casing chamber in excess ofY delivery therefrom to theplace of use'accumulating inthe standf pipe to'said predetermined height operates tohalt-the discharge of the liquid from the container and halt its descendingmovement l'and preventclosure-'ot1 the atmosphere port andthe refestablishment of predominance of suction until engine consumption lat the place of use lowers the level of liquid inthe standipe..y p'f. "The construction defined in claim l, the casing having the means for atmosphere access consisting of anopening in 'its wall, and the valve controlling atmosphere accessibeing seated `at said opening, the container being upwardlygopen in the casing chamber, and said chamber being without atmosphere laccess -exceptat said valve-controlled opening,^'the casinghaving a suction connection, and having connection for liquid inflow Vat 'theupper part at a pointjfor discharge of the liquid into the vopen upperV end ofthe container. A

6. yA 'construction for moving liquidto a higher levelV from a source ata lower level -and"delivering'it-by'gravity toa place of use or l accumulation, comprising a liquid container' into Awhich the liquid is drawn' from the lower source and in which itis retained 'against fgravity discharge by suction due tovacuum in the cavity of the container, said 'container Ihaving connection constituting accessfor 'suction yand means `for air out-let toa source "of'suction, and independent'confnection I for liquid inflow from the liquid source, said container beingconstructed and @arranged for 'discharge of liquid therefrom 'by gravity upon relief of the suction, and 4bei-lig mounted' for up#and-down'smovement, 'andyielding means by which said container is yieldin'gly upheld 'at a predeterminedpositan, said container having also'` access for atmosphericpressure, and means for alter,- nating the dominance of suctionand -atmospheric 'pressure in the: container cavity, said means comprising an element -arranged'for actuation inv onedirection in `the movement of the container due to its weight plus that ofthe liquid content thereof exceeding the resistance of the, yieldingupholding means, .and in the other direction by the reaction of saidl'means upon thedelivery of theliquid thefcontainer relieving'it'of said-plus weight, an enclosing casing whose cavity Vis at all times in fluidpressurecommunication with thecavity of the container, the

connection of the container for -suction 'v and .higher level Yfrom a source at a lowerlevel and delivering it by gravity to a place ,of use or accumulation, comprising `a liquid container into which'the liquid is drawn from the lower sourcewanud iny which itisretained f against gravity discharge by suction due'to vacuum in the cavity of the container, said container having connectionconstituting access for suction andmeans for air outlet to a source of suction, and independent connection for liquid 4 inflow from Vthe I.liquid source, said container being constructed and arrangedfor discharge of'liquid therefrom by gravity upon relief of the suction, and being mounted for up-and-down movement, and yielding means by which said container isy yieldingly upheld at a predetermined positio'n', said container having 'also access 'for atmospheric pressure, Yand meansY for alternating'the dominance of suction and atmospheric pressure inthe container cavity, said means comprising an element arranged'for actuation in one direction inthe movement of the container 'due to its weight plus that of'theliquid content thereof exceeding/the resistance of Vtheyielding upholding means, and in the otherdirection by the reaction of said means upon the delivery ofthe liquid from 'the container relievingyit ofsaid plus weight, a casing structure having a cavity in which said containerY is enclosed, said 'cavity being in fluid'pressure communication with 'the' cavity of the containenthe connection of the container for suc'tion'and atmosphere access being 'afforded by suction and atmosphere connections withwhich-said enclosing casing is provided, said vcasing halv-ing'at the bottom adischar'g'e fitting with apa'ssa'ge opening at Vone end in said'cavity of-the casing and at the 'other endioutside said cavity, andat said outerend providedfwith 'a'valve arranged 'to"be"nor1nal'ly s'eate'dfand adapted tobe opened by fluid discharge' from the l'itting, the container having at the bottom a LAdischarge nipple :arranged to telescopein theentrance to the passage of said itting, the casing comprising a Vpart having a second cavity in which the valve discharge yfitting vis enclosed 'and discharges, said casing part `being arranged for having a liquid delivery itc 

